irqchip/mbigen: move to use bus_get_dev_root()

Direct access to the struct bus_type dev_root pointer is going away soon
so replace that with a call to bus_get_dev_root() instead, which is what
it is there for.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230313182918.1312597-21-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
index f3faf5c9977064761b6b0c441d98fb8430f73b8a..30ca1bf7fc8bd462cc9fa66e26798a592ef4b81d 100644 (file)
--- a/drivers/irqchip/irq-mbigen.c
+++ b/drivers/irqchip/irq-mbigen.c
@@ -245,11 +245,14 @@ static int mbigen_of_create_domain(struct platform_device *pdev,
                if (!of_property_read_bool(np, "interrupt-controller"))
                        continue;
 
-               parent = platform_bus_type.dev_root;
-               child = of_platform_device_create(np, NULL, parent);
-               if (!child) {
-                       of_node_put(np);
-                       return -ENOMEM;
+               parent = bus_get_dev_root(&platform_bus_type);
+               if (parent) {
+                       child = of_platform_device_create(np, NULL, parent);
+                       put_device(parent);
+                       if (!child) {
+                               of_node_put(np);
+                               return -ENOMEM;
+                       }
                }
 
                if (of_property_read_u32(child->dev.of_node, "num-pins",